soc/amd/picasso: Place early stages and data buffers at the bottom of DRAM

This change updates memlayout.ld for Picasso to place all early
stages (bootblock, romstage, FSP-M, verstage) and data buffers (vboot
workbuf, APOB, preram-cbmem console, timestamp, early BSP stack) at
the bottom of DRAM starting at 32MiB. This uses static allocation for
most components by defining Kconfig variables for base and size. It
relies on the linker to complain if any of the assumptions are broken.

This also allows romstage to use linker symbols for
_early_reserved_dram and _eearly_reserved_dram to store information in
CBMEM about the early DRAM usage by coreboot before ramstage starts
execution. This allows ramstage to reserve this memory region in BIOS
tables so that S3 resume can reuse the same space without corrupting
OS memory.

BUG=b:155322763
TEST=Verified memory reported by coreboot:
Writing coreboot table at 0xcc656000
 0. 0000000000000000-0000000000000fff: CONFIGURATION TABLES
 1. 0000000000001000-000000000009ffff: RAM
 2. 00000000000a0000-00000000000fffff: RESERVED
 3. 0000000000100000-0000000001ffffff: RAM
 4. 0000000002000000-000000000223ffff: RESERVED
 5. 0000000002240000-00000000cc512fff: RAM
 6. 00000000cc513000-00000000cc6bffff: CONFIGURATION TABLES
 7. 00000000cc6c0000-00000000cc7c7fff: RAMSTAGE
 8. 00000000cc7c8000-00000000cd7fffff: CONFIGURATION TABLES
 9. 00000000cd800000-00000000cfffffff: RESERVED
10. 00000000f8000000-00000000fbffffff: RESERVED
11. 0000000100000000-000000042f33ffff: RAM
12. 000000042f340000-000000042fffffff: RESERVED

Signed-off-by: Furquan Shaikh <furquan@google.com>
Change-Id: I009e1ea71b5b5a8e65eba16911897b2586ccfdb6
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42264
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>

1 files changed, 25 insertions, 0 deletions

diff --git a/src/soc/amd/picasso/memmap.c b/src/soc/amd/picasso/memmap.c
index 5f4ba42da1..42a330726e 100644
--- a/src/soc/amd/picasso/memmap.c
+++ b/src/soc/amd/picasso/memmap.c
@@ -4,12 +4,14 @@
 
 #include <assert.h>
 #include <stdint.h>
+#include <cbmem.h>
 #include <console/console.h>
 #include <cpu/x86/smm.h>
 #include <cpu/amd/msr.h>
 #include <memrange.h>
 #include <fsp/util.h>
 #include <FspGuids.h>
+#include <soc/memmap.h>
 
 /*
  * For data stored in TSEG, ensure TValid is clear so R/W access can reach
@@ -57,3 +59,26 @@ void smm_region(uintptr_t *start, size_t *size)
 		once = 1;
 	}
 }
+
+void memmap_stash_early_dram_usage(void)
+{
+	struct memmap_early_dram *e;
+
+	e = cbmem_add(CBMEM_ID_CB_EARLY_DRAM, sizeof(*e));
+
+	if (!e)
+		die("ERROR: Failed to stash early dram usage!\n");
+
+	e->base = (uint32_t)(uintptr_t)_early_reserved_dram;
+	e->size = REGION_SIZE(early_reserved_dram);
+}
+
+const struct memmap_early_dram *memmap_get_early_dram_usage(void)
+{
+	struct memmap_early_dram *e = cbmem_find(CBMEM_ID_CB_EARLY_DRAM);
+
+	if (!e)
+		die("ERROR: Failed to read early dram usage!\n");
+
+	return e;
+}